Google's CEO Larry Page has lost his voice and will not be speaking at the company's upcoming public events, a spokeswoman for the company said on Thursday.

The spokeswoman confirmed that Google's Executive Chairman Eric Schmidt had told shareholders at Google's Mountain View headquarters earlier in the day that Page would not be speaking at the company's Google I/O developer conference next week, and also possibly at the company's second-quarter earnings call, scheduled for next month.

Page did not speak at the shareholder event. He was noticed to have difficulty in speaking and his voice was strained in his recent speeches. It is not known what is the medical condition that is causing the loss of voice, and when he will be back to speaking in public.

Page, Google’s co-founder, replaced Schmidt as CEO last year. Google I/O is scheduled to start on Wednesday in San Francisco.

John Ribeiro covers outsourcing and general technology breaking news from India for The IDG News Service. Follow John on Twitter at @Johnribeiro. John's e-mail address is john_ribeiro@idg.com